Shanny had already implemented the offense for RG3, and was very good with it before Roman put the same to Kaep. Almost a 16 games season ahead of Roman.
Shanny and Saleh already know how to stop it. It's a matter of getting their defensive players to defend it.
They had 3 weeks straight with Murray and Wilson. This defense should be good to go against LJ. Getting tired of chasing LJ into the 4th qtr is the thing to worry about. Get a rotational in would help. Or TOP offense.